Use the definite integral to find the area between the x-axis and f(x) over the indicated interval. Check first to see if the graph crosses the x-axis in the given interval.\ f(x) = 3x^2; [-1, 3]\ The area between the x-axis and f(x) is $\frac{123}{2}$. (Simplify your answer.)
Added by Stanley G.
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To do this, we can find the values of f(x) at the endpoints of the interval. When x = 1, f(1) = 3(1)^3 = 3(1) = 3. When x = 3, f(3) = 3(3)^3 = 3(27) = 81. Since f(1) = 3 and f(3) = 81, and both values are positive, the graph of f(x) does not cross the x-axis in Show more…
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